Only hurts if you do it wrong. x;
Because the pins are barely under the first layer of skin, there are no nerves to feel any pain. It feels weird -almost numb- but is pretty entertaining. I didn't think to close the pins before taking the picture, though.
I didn't see it before, but my fingers are totally butchered from doing that today. I can see the now-torn skin sticking up on all of the fingers on my right hand and in multiple places on one finger on my left hand. I: Perhaps next time I'll do it on my hand, instead, so I can attempt to hide it.